Model & package intelligence
Model text, package form, tray or reel details, and visual evidence are reviewed together before RFQ feedback.
SILAN SD4950TR
Configuration
1 options
Configuration
26+
Available for RFQ
Technical data
Product details
19
specifications
Core information
- Product name
- SILAN SD4950TR
- Type
- SILAN
- Minimum package
- 4000 圆盘
Technical parameters
- Electronic Component
- Electronic Component
- Electronic Component
- SILAN
- Electronic Component
- SD4950TR
- Electronic Component
- 1
- Package
- SOP-8
- Electronic Component
- DC-DC Power Supply IC
- Electronic Component
- 0.197g
- Electronic Component
- 1
- Type
- Electronic Component
- Synchronous
- Electronic Component
- Electronic Component
- BM0231129541
- Operating Temperature
- 40℃~+85℃
- Operating Voltage
- 36V~72V
- Switching Frequency
- 160kHz~200kHz
- Electronic Component
- Electronic Component
- Output Current
- 960mA
For datasheets, package documents, compatible-part guidance, or other technical resources, contact WMSIC customer service. Availability is confirmed case by case.
SD4950TR 产品概述
一、核心特性
SD4950TR 为士兰微（SILAN）推出的降压型开关稳压器，采用反激式拓扑，集成开关管（内置），适用于36V72V的宽输入电压范围；输出为固定类型，最大输出电流可达960mA。工作开关频率在160kHz200kHz之间，静态电流（Iq）仅约350μA，工作温度范围为-40℃~+85℃，封装为SOP-8。该器件不支持同步整流（同步整流：否），因此次级应配合整流二极管使用。
二、典型应用场景
- 基于48V直流母线的辅助电源与模块电源（如通信、工业控制、车载辅助电源等）。
- 小功率离线适配器和电池供电系统的隔离/非隔离电源（根据具体参考设计）。
- 需要低待机功耗的系统，由于静态电流低，适合对待机功耗有较高要求的应用。
三、设计要点与建议
- 反激拓扑下应重点优化变压器（或电感）匝比与磁芯选型，以匹配36~72V宽输入并保证满载时次级电压稳定。
- 由于无同步整流，次级整流建议采用低正向压降的肖特基二极管以降低整流损耗。
- 开关频率160~200kHz在降低磁性器件体积与控制开关损耗之间做平衡，选择具体频点时需考虑EMI与变压器损耗。
- 输出滤波电容应选择低ESR类型以降低纹波与提高瞬态响应。
四、热管理与PCB布局
- SOP-8封装散热能力有限，高效率设计与良好散热通道（充足的铜箔、热铜垫）对稳定工作温度至关重要。
- 关键器件（开关管、变压器、二极管、电容）应合理分区布局，缩短功率回路路径，减小寄生电感以降低EMI与振铃。
- 在开关管回路处设置合适的RC或RCD吸收，抑制开关瞬态过冲，保护器件并降低电磁干扰。
五、选型与注意事项
- 评估输出功率时需考虑整流损耗与开关损耗，实际可用输出电流在不同输入电压与温度下会有所变化。
- 若需更高效率或更低次级损耗，可考虑带同步整流的替代方案或在次级增加主动整流电路。
- 设计时应增加必要的保护措施（过流、短路、过温、输入过压/欠压），并参考厂商样片与参考设计以获得可靠性能。
总体而言，SD4950TR 面向需要宽输入电压、低静态功耗和中小功率输出的降压类电源应用，适配48V级电源系统时具有较好的成本与集成度优势。若需具体电气特性曲线、管脚定义和参考电路，请参阅士兰微官方资料或联系供应商获取详细数据手册。
Request for quote
Send RFQ
Use the form for single models, category sourcing, and multi-line BOM requirements.
Product sourcing intelligence
Model, package, availability, and BOM fit reviewed before quotation.
WMSIC turns product data, package visuals, BOM context, and sourcing signals into practical RFQ notes for buyers.
BOM matching & alternatives
BOM lines are compared by package, parameters, quantity, and workable alternatives for cleaner sourcing decisions.
Sourcing availability signal
Stock routes, quotation confidence, lead-time notes, and shipment feasibility are checked before sales follow-up.
Buyer sourcing scenarios
Examples of how common component sourcing requests are organized.
Typical RFQ scenarios based on the WMSIC form fields, catalog data, manual review steps, and shipment preparation workflow.
The buyer shares the full part number, package requirement, quantity, destination, and available product photos so the quotation can record the exact version under review.
A multi-line BOM is organized into direct sourcing lines, lines that need package clarification, and lines where alternative-part review is permitted.
The original manufacturer part number, datasheet revision, application, critical limits, and acceptable changes are collected before possible candidates are discussed.
Sample quantity, minimum packing, package format, target date, and courier destination are kept together in one RFQ conversation.
Package photos, model markings, board context, and the quantity needed for repair help focus the sourcing review on the relevant version.
When a suffix or package note is incomplete, the response records the open difference and requests buyer confirmation before procurement proceeds.
Packing format, carton notes, invoice details, courier option, destination, and tracking handoff are coordinated around the confirmed order.
The request connects the previously used model, current demand, package evidence, target timing, and replenishment sourcing route.
Related products
Packaged components ready for RFQ.
